Hey Rishabh, I understand the situation you're going through but believe me there's nothing to be much depressed about as these marks are a part and parcel of life and won't matter much after you join a college. You may either try reappearing for improvement of your score in boards if you are sure to take it up and are ready to take a drop.

At 81% you rank comes about 194370 - 218500 where it is very difficult to secure a seat at AKTU counselling as those seats close around CRL rank of 1.32L approx. Use the rank predictor tool:

https://engineering.careers360.com/jee-main-rank-predictor

However, there are many other colleges available in UP that accept admissions at this rank, you can try using the college predictor to find out the best colleges at your rank:

https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

Hope it helps you, feel free to ask any query, thanks!